Even a 4lb foamy will be a very large plane and perfect for those packs wired with a connector into 4S packs.

The 120A ESC will also work with this setup just fine.

Assuming the lowest batteries he stated

3700mAh 2S 25C x 2 = 3700mAh 4S 25C

3700mah x .15 = 555 watts continuous

555w / 14.8v = 37A draw continuous ( more in bursts ).

So exactly as I originally told him, he could get a .25 - .32 equivalent motor rated around 750w burst and put that in a .25-.32 aerobatic or 3D plane.

Assuming a typical 11K RPM rate with 13K unloaded

13,000 / 14.8v = 878 KV

So a motor rated for 40-50A, 880KV and 750watts is what he needs along with a prop that will allow the motor to spin around 10-11K at full throttle on the ground. A 12x6e prop or a 12x7e prop will produced the required draw from the motor.

Or if he wants to re-use his existing motor, he can go with a gear drive as I stated....

However given the cost of the gearing and mounts, it's cheaper for him to merely order a new motor that conforms to what I've stated, and a serial adapter for his packs. That's less than a $40.00 expense.

The motor comes with the prop nut, so the standoffs and spinners may be the only other things needed.

While the 120A ESC is overkill, it's use will not hurt anything as long as it is programmed to turn off braking and other car related functions.

Any plane that falls into the size catagory I mentioned will work fine, especially if it is suitable for electrification ( e.g. it has a battery hatch, etc. ).

$200.00 should be enough to get the motor, servos and plane from places like HK ( USA ) or BPHobbies.


Here is a perfect match: [link=http://www.hobbyking.com/hobbyking/store/__17951__Hobbyking_Moneyshot_3D_1350mm_ARF_.html]3D Plane[/link]

Another: [link=http://www.hobbyking.com/hobbyking/store/__18224__Yak_54_30ep_1280mm_ARF_.html]YaK 3D[/link]

[link=http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=14904]Pitts[/link]